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Former SpaceX engineer Jeff Thornburg has raised 50 million dollars for his startup Portal Space Systems, aiming to revive NASA's solar thermal propulsion concept and develop faster, more efficient ...

Early science fiction writers and mid-20th-century engineers envisioned solar power satellites, but economic and technical barriers stalled progress for decades. Elon Musk and Jeff Bezos have revived ...

The Apollo space missions of the 1960s, which took humans to the moon for the first time, relied on brute-force propulsion more than technological sophistication. The onboard Apollo Guidance Computer ...